Xbox one

https://www.youtube.com/watch?v=fZhvPYLZt3Y

Here's a link for Jan. 3rd, 2020, daily challenge. If that wasn't helpful definitely look into other videos on Youtube.

My games cds i buy wont in to

All versions of the One work the same way.

It is also possible to pre download the Xbox One X enhanced assets on your existing console to save you some time doing this when you get your Xbox One X.

https://news.xbox.com/en-us/2017/11/03/prepare-yourself-for-xbox-one-x/

No. You'll just plug in and continue to play like normal.

Its technically a different device with a different OS. How can it swap XBOX's without needing to reformat?

No. You'll just plug in and continue to play like normal.